Shane Wesley Stone

Investigating significant model-observation discrepancies of protonated species in the Martian ionosphere

Long Cheng, E. Vigren, Shane Wesley Stone, M. Benna

ABSTRACT Ions with mass-to-charge ratios from 2 to 150 have been measured in the Martian ionosphere by the Neutral Gas and Ion Mass Spectrometer (NGIMS) onboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. Among these, protonated species at 31, 33, and …

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Investigating Significant Model-Observation Discrepancies of Protonated Species in the Martian Ionosphere

Long Cheng, E. Vigren, Jun Cui, Shane Wesley Stone et autres

Ions with mass-to-charge ratios from 2 to 150 have been measured in the Martian ionosphere by the Neutral Gas and Ion Mass Spectrometer (NGIMS) onboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. Among these, protonated species at 31, 33, and 41 …

MAVEN Observations of Metallic Fe + Distributions in the Martian Ionosphere

Andrew Reinhold Poppe, Glyn A Collinson, M. Benna, Shane Wesley Stone et autres

Abstract Metallic ions deposited in planetary atmospheres via meteoroid ablation are an invaluable tool for understanding electric fields, atmospheric winds, and minor ion transport. At Mars, metallic ion distributions are poorly understood. We analyze MAVEN/NGIMS distributions in the Martian ionosphere over the …

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Reviewing 41 amu ions in the Martian Ionosphere

Long Cheng, E. Vigren, Shane Wesley Stone, Mehdi Benna

We make use of photochemical modelling and measurements by the Neutral Gas and Ion Mass Spectrometer (NGIMS) onboard the Mars Atmosphere and Volatile EvolutioN mission (MAVEN) in an attempt to identify the ion species that dominate the sub-population of ions in the …

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What drives Mars’ nightside Ionosphere? Insights from in situ and remote sensing

Robert James Lillis, M. Marquette, Majd Mayyasi, Yingjuan Ma et autres

Mars’ nightside ionosphere is highly variable and poorly understood, with several internal, external, and local factors affecting multiple sources of ionospheric plasma, all combining to drive highly complex behavior. The three primary plasma sources are a) planetary rotation and cross-terminator ion winds …

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The Martian upper atmosphere’ thermal structure and variability as revealed by Maven & TGO combined datasets

Miguel Angel Lopez-Valverde, Edward M. B. Thiemann, Juan José Gómez Alday, Nicholas Jones et autres

The upper atmosphere of Mars, including the mesosphere (60-120 km) and thermosphere (120 up to the exobase, around 180-230 km), is no doubt the less explored region of the red planet. Two recent and on-going missions to Mars are investigating these altitudes …

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Mesospheric and thermospheric temperatures on Mars: comparing a multi-mission dataset with a Global Climate Model

Francisco González‐Galindo, Sumedha Gupta, Edward M. B. Thiemann, Juan Alday et autres

The study of the coupling between the lower and the upper atmosphere has been hindered by the lack of continuous temperature measurements covering the whole atmosphere from the surface to the exobase. Thus, a large fraction of our knowledge on the topic …

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The climatology of the homopause altitude from the Mars Planetary Climate Model

Juan Alday, Francisco González‐Galindo, Shane Wesley Stone, Denis A. Belyaev et autres

Introduction: The homopause defines the boundary between two distinct regions of the atmosphere: the homosphere and the heterosphere. In the homosphere, located below the homopause, strong turbulent mixing causes atmospheric gases to vary vertically according to a common scale height, determined by …

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Martian atmospheric hydrogen and deuterium: Seasonal changes and paradigm for escape to space

John Thacher Clarke, Majd Mayyasi, Dolon Bhattacharyya, Jean‐Yves Chaufray et autres

Mars' water history is fundamental to understanding Earth-like planet evolution. Water escapes to space as atoms, and hydrogen atoms escape faster than deuterium giving an increase in the residual D/H ratio. The present ratio reflects the total water Mars has lost. Observations …

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CO2 in the atmosphere of Mars depleted in 13C

Giuliano Liuzzi, Geronimo Luis Villanueva, Shohei Aoki, Shane Wesley Stone et autres

We present here vertically resolved measurements of the carbon isotopic composition of CO2 in the Martian atmosphere between the surface and 50 km of altitude. The results are based on data taken by the ExoMars Trace Gas Orbiter with the NOMAD instrument …

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A 3 Martian Year climatology of aerosols with ExoMars TGO-NOMAD: seasonal cycles and new insights

Giuliano Liuzzi, Geronimo Luis Villanueva, Shohei Aoki, Loïc Trompet et autres

The Nadir and Occultation for MArs Discovery (NOMAD) spectrometer has been collecting Mars observations since 2018, providing a massive amount of information regarding its atmospheric composition, its vertical structure and bridging the gap between the previous knowledge of the lower atmosphere and …

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Measuring the 13C/12C in the lower atmosphere of Mars with NOMAD/TGO: challenges and interpretation

Giuliano Liuzzi, Geronimo Luis Villanueva, Shane Wesley Stone, Sara Faggi et autres

The two infrared spectrometers onboard the ExoMars Trace Gas Orbiter (TGO) spacecraft, the Atmospheric Chemistry Suite (ACS) and the Nadir and Occultation for MArs Discovery (NOMAD) have been providing observations since April 2018 and are a unique source of information to unveil …

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